2.To determine that smoke is capable of entering the sens- ing chamber, a visual examination should be conducted to note any obscurations around the sensing chamber. If a smoke test is required, smoke such as cigarette, cot- ton wick, or punk smoke may be blown directly at the smoke detector head. It is important to plug the exhaust and sampling tube hole to prevent ducted air from blow- ing smoke away from the smoke detector head. Record all test records in the Detector Test Log (page 12).

CAUTION

Remember to remove the plugs after this test or the detec- tor will not sense smoke in the air duct.

7.2 Alarm Tests

Before replacing the duct housing cover, the detector interconnections should be checked. The DH500 may be checked as follows:

A. M02-04-00 Magnet Test

1.Make sure power is applied to the detector.

2.Place the painted surface of the test magnet against the housing next to the rib molded onto the outside of the housing (see Figure 7).

3.The LEDs on the detector should latch on as should any accessories (i.e. RA400ZA, RTS451), and the alarm condition should be verified at the control panel.

Figure 7. Testing detector

Figure 8. Detector head removal:

DETECTOR

HEAD

TWIST

COUNTERCLOCKWISE

TO REMOVE

DUCT H0276-00

HOUSING

TWIST

CLOCKWISE

TO INSTALL

B. RTS451/RTS451KEY Remote Test Station

The RTS451/RTS451KEY Remote Test Station facilitates test of the alarm capability of the duct detector as indicated in the RTS451/RTS451KEY manual. The DH500 duct detector cannot be reset by the RTS451/RTS451KEY. It must be reset at the system control panel.

To install the RTS451/RTS451KEY test coil, connect the device as shown in Figure 9; wire runs must be limited to 25 ohms or less per interconnecting wire. Place the coil in the detector housing with the arrow facing up and pointing toward the detector as in Figure 9. Attach the coil leads to the housing terminals as shown; polarity is not important. Firmly screw the bracket in place over the test coil.

DUCT DETECTOR HOUSING

TEST

MAGNET

MOLDED RIB

PAINTED SIDE

TOWARD HOUSING

H0275-00

DETECTOR

HEAD

7.3 MOD400 Sensitivity Test

After verification of alarm capability, the MOD400 test module may be used with a voltmeter to check detector sensitivity as indicated in the MOD400 installation manual. The housing cover must be removed to perform this test.

If the MOD400 readings indicate that the detector head is outside of the acceptable range, the detector head requires cleaning. (See Periodic Maintenance Requirements on page 9.)

7.4 Trouble Test

The capability of “TROUBLE” detection is tested by remov- ing the detector head from the duct housing. The detector head is removed by turning it counterclockwise about 10 degrees (Figure 8). The system control panel should indi- cate a trouble condition. Reinserting the detector head should clear the trouble condition.

D500-08-00

7

I56-512-07R

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System Sensor Intelligent Air Duct Smoke Detector Housing Alarm Tests, RTS451/RTS451KEY Remote Test Station, Trouble Test
Page 6 Page 8

DH500, Intelligent Air Duct Smoke Detector Housing specifications

The System Sensor DH500 is an advanced intelligent air duct smoke detector housing designed to effectively monitor and detect smoke within HVAC ducts. As smoke detection in air handling systems is critical to ensuring the safety of occupants, the DH500 utilizes cutting-edge technology to provide reliable performance and early warning capabilities.

One of the main features of the DH500 is its intelligent detection capabilities. The device employs photoelectric sensing technology, which is well-suited for detecting the slow-burning fires that often generate more smoke than flames. This technology allows for prompt detection of smoke particles while minimizing false alarms caused by dust or other non-threatening particles. The DH500 is designed to operate efficiently in various environments, making it ideal for commercial and industrial settings.

The DH500 is equipped with a low-profile design, providing ease of installation and a more aesthetically pleasing appearance that blends seamlessly with existing ductwork. The housing is made from durable materials, ensuring long-lasting performance and resilience against environmental factors.

Another significant characteristic of the DH500 is its ability to accommodate multiple detectors. The housing can integrate with a variety of smoke detectors, allowing for installation flexibility depending on specific needs and applications. This modularity is particularly advantageous in large buildings where multiple air ducts may need simultaneous monitoring.

The device also incorporates advanced communication options, allowing for compatibility with various fire alarm control panels. This enables real-time monitoring and integration into broader building safety systems, enhancing overall emergency response capabilities. Moreover, the DH500 features an intuitive status indicator that provides visual confirmation of operational performance, making maintenance and monitoring straightforward.

In terms of maintenance, the DH500 is designed for easy access to the smoke detectors, ensuring they can be inspected and cleaned regularly, optimizing their efficiency and longevity. Regular maintenance plays a crucial role in the reliability of smoke detection systems, and the DH500's user-friendly design supports this essential function.

In summary, the System Sensor DH500 intelligent air duct smoke detector housing stands out for its intelligent detection technology, low-profile design, compatibility with multiple detectors, and advanced communication capabilities. Its durable construction and focus on ease of maintenance further enhance its appeal for commercial and industrial applications, making it a reliable choice for effective smoke detection in air handling systems.
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